Improve diagnostics for build hashes

.travis.yml

@@ -19,6 +19,7 @@ install:
 before_script:
   - avr-gcc --version
 script:
+- git rev-parse --short HEAD
 - make test:all AUTOGEN=false
 - bash util/travis_build.sh
 - bash util/travis_docs.sh
@@ -33,7 +34,7 @@ addons:
     - diffutils
     - dos2unix
     - doxygen
-after_success: 
+after_success:
   bash util/travis_compiled_push.sh
 notifications:
   webhooks: